source: ntrip/trunk/BNC/qwt/qwt_sampling_thread.cpp@ 6381

Last change on this file since 6381 was 4271, checked in by mervart, 12 years ago
File size: 2.2 KB
RevLine 
[4271]1/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2 * Qwt Widget Library
3 * Copyright (C) 1997 Josef Wilgen
4 * Copyright (C) 2002 Uwe Rathmann
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the Qwt License, Version 1.0
8 *****************************************************************************/
9
10#include "qwt_sampling_thread.h"
11#include "qwt_system_clock.h"
12
13class QwtSamplingThread::PrivateData
14{
15public:
16 QwtSystemClock clock;
17
18 double interval;
19 bool isStopped;
20};
21
22
23//! Constructor
24QwtSamplingThread::QwtSamplingThread( QObject *parent ):
25 QThread( parent )
26{
27 d_data = new PrivateData;
28 d_data->interval = 1000; // 1 second
29 d_data->isStopped = true;
30}
31
32//! Destructor
33QwtSamplingThread::~QwtSamplingThread()
34{
35 delete d_data;
36}
37
38/*!
39 Change the interval (in ms), when sample() is called.
40 The default interval is 1000.0 ( = 1s )
41
42 \param interval Interval
43 \sa interval()
44*/
45void QwtSamplingThread::setInterval( double interval )
46{
47 if ( interval < 0.0 )
48 interval = 0.0;
49
50 d_data->interval = interval;
51}
52
53/*!
54 \return Interval (in ms), between 2 calls of sample()
55 \sa setInterval()
56*/
57double QwtSamplingThread::interval() const
58{
59 return d_data->interval;
60}
61
62/*!
63 \return Time (in ms) since the thread was started
64 \sa QThread::start(), run()
65*/
66double QwtSamplingThread::elapsed() const
67{
68 if ( d_data->isStopped )
69 return 0.0;
70
71 return d_data->clock.elapsed();
72}
73
74/*!
75 Terminate the collecting thread
76 \sa QThread::start(), run()
77*/
78void QwtSamplingThread::stop()
79{
80 d_data->isStopped = true;
81}
82
83/*!
84 Loop collecting samples started from QThread::start()
85 \sa stop()
86*/
87void QwtSamplingThread::run()
88{
89 d_data->clock.start();
90 d_data->isStopped = false;
91
92 while ( !d_data->isStopped )
93 {
94 const double elapsed = d_data->clock.elapsed();
95 sample( elapsed / 1000.0 );
96
97 if ( d_data->interval > 0.0 )
98 {
99 const double msecs =
100 d_data->interval - ( d_data->clock.elapsed() - elapsed );
101
102 if ( msecs > 0.0 )
103 usleep( qRound( 1000.0 * msecs ) );
104 }
105 }
106}
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